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Title:Experimental studies of multipass beam breakup and energy recovery using the CEBAF injector linac
Author(s):Sereno, Nicholas S.R.
Doctoral Committee Chair(s):Cardman, Lawrence S.
Department / Program:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, General
Abstract:Beam breakup (BBU) instabilities in superconducting linacs are a significant issue due to the potentially high Q of the cavity higher-order modes (HOMs). The CEBAF accelerator, which employs five pass recirculation through two superconducting linacs to accelerate high CW current (up to 200 $\mu$A), poses unique instability problems. An experimental investigation of multipass BBU at CEBAF has been completed using a single recirculation through the CEBAF injector linac. This recirculator is calculated to be more sensitive to the instability than the full CEBAF accelerator. Successful recirculation through the injector of a beam with greater than 200 $\mu$A average current from an injection energy of 5.6 MeV to a final energy of 80.1 MeV indicates that BBU should not be a problem in the full CEBAF accelerator. In addition, we were able recover all the energy from a 30 $\mu$A 42.8 MeV first pass beam by recirculating it out of phase and decelerating it to a final energy equal to the injection energy (5.6 MeV).
Issue Date:1994
Rights Information:Copyright 1994 Sereno, Nicholas S. R.
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9416432
OCLC Identifier:(UMI)AAI9416432

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